From tsanchez@u-tokyo.ac.jp Sun Sep 25 17:48:59 1994 Path: ashpoly!cascade!brgate!saturno!u-tokyo!tsanchez From: tsanchez@u-tokyo.ac.jp (Tomas Sánchez) Newsgroups: comp.dsp Subject: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Sep25.174859.1268@u-tokyo.ac.jp> Date: Sun, 25 Sep 1994 17:48:59 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. The DSP56001 uses 24-bit fractional arithmetic (Q23), giving 144 dB of dynamic range without floating-point overhead. Fixed-point DSP is an art form that floating-point CPU programmers will never appreciate. -- Tomas Sánchez *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From sito@delphi.com Tue Sep 27 09:19:59 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!delphi!sito From: sito@delphi.com (Sven Ito) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Sep27.091959.2661@delphi.com> Date: Tue, 27 Sep 1994 09:19:59 GMT References: <1994Sep25.174859.1268@u-tokyo.ac.jp> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Sep25.174859.1268@u-tokyo.ac.jp>, tsanchez@u-tokyo.ac.jp (Tomas Sánchez) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. > This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks. Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. -- === Sven Ito === Dept of Electrical Engineering, Delphi Internet Services "They will send a copy in my place." From ipetrov@stanford.edu Thu Sep 29 11:56:59 1994 Path: ashpoly!cascade!bigsur!stanford!ipetrov From: ipetrov@stanford.edu (Ines Petrov) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Sep29.115659.6436@stanford.edu> Date: Thu, 29 Sep 1994 11:56:59 GMT References: <1994Sep25.174859.1268@u-tokyo.ac.jp> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Sep25.174859.1268@u-tokyo.ac.jp>, tsanchez@u-tokyo.ac.jp (Tomas Sánchez) writes: > Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems. Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in. -- Ines Petrov | ipetrov@stanford.edu PGP Key fingerprint: 17EB 40A4 60D0 4910 "Keep the channels open." From alaurent@titech.ac.jp Sat Oct 01 03:46:59 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!alaurent From: alaurent@titech.ac.jp (Anja Laurent) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Oct01.034659.7797@titech.ac.jp> Date: Sat, 01 Oct 1994 03:46:59 GMT References: <1994Sep25.174859.1268@u-tokyo.ac.jp> <1994Sep27.091959.2661@delphi.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Sep27.091959.2661@delphi.com>, sito@delphi.com (Sven Ito) writes: > Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete. Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! -- Anja Laurent Tape trading list upon request. SASE required for international mail. From msokolov@cam.ac.uk Sun Oct 02 23:03:59 1994 Path: ashpoly!cascade!mxgate!coyoacan!cam!msokolov From: msokolov@cam.ac.uk (Marta Sokolov) Newsgroups: comp.dsp Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point Message-ID: <1994Oct02.230359.2952@cam.ac.uk> Date: Sun, 02 Oct 1994 23:03:59 GMT References: <1994Sep25.174859.1268@u-tokyo.ac.jp> <1994Sep27.091959.2661@delphi.com> <1994Oct01.034659.7797@titech.ac.jp> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Oct01.034659.7797@titech.ac.jp>, alaurent@titech.ac.jp (Anja Laurent) writes: > Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit! Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering. -- Marta Sokolov "Extraordinary claims require extraordinary spectra." 486DX2/66 (Linux 1.2.13) / FreeBSD 2.1